When your pet’s health has been compromised by a serious problem or as a result of normal aging, our Immune Strengthener’s blend of natural vitamins, herbs, antioxidants and mushrooms can provide immune system support to help your dog or cat fight chronic health issues while supporting organ function.

This formula supplies a wide range of antioxidant ingredients to foster the maximum reduction of free radical damage to cells. We also included some of the finest known immune-supportive herbal ingredients like Cat's Claw and Reishi, Shiitake and Maitake mushrooms, three of the most effective and commonly used mushrooms in Chinese herbal medicine.

One of the best selling and most popular items in our Only Natural Pet product line, Immune Strengthener consistently draws rave reviews from our customers. We hear from guardians dealing with all kinds of health issues in their pets; needing everything from general immune system and cardiovascular maintenance to liver & kidney support.

Carefully Selected Ingredients

Reishi, Shiitake, and Maitake Mushrooms: Used in Traditional Chinese Medicine (TCM) for centuries, these mushrooms have immune-supporting properties that have been demonstrated consistently by modern research. The immune support benefits are attributed to their high levels of polysaccharides and their effect on key white blood cells. These mushrooms are also recognized for their support of the body's normal inflammatory response as well as their anti-microbial and antioxidant properties.

Cat's Claw (Uncaria tomentosa): This powerful herb from the upper Amazon has supporting properties for the body's immune system and inflammatory response. Research suggests that the alkaloids present in the herb are the key to its immune-supporting, anti-viral and antibacterial action. The alkaloids are believed to maintain white blood cell production and to help these critical cells isolate and attack foreign invaders.

Astragalus: Another herb used in TCM, Astragalus has been employed for centuries to balance the vital energy, or qi. Astragalus has been used to help maintain normal functions of the liver, lungs, kidney, spleen, stomach and heart. The beneficial properties of Astragalus support the immune system through its antioxidant action and energy-boosting potential, and by supporting production of white blood cells.

Vitamin C: The first scientifically recognized antioxidant, Vitamin C is the tried-and-true free radical scavenger we use to help support our immune system, from the common cold to the most serious of autoimmune and organ dysfunctions. Many research findings concur that Vitamin C plays a key role in supporting the direct activity of key white blood cells, and helping to support normal cells against damage, particularly damage caused by environmental toxins.

Vitamin E: The second most widely known and used antioxidant vitamin, this fat-soluble vitamin is essential for maintaining a strong immune system, and research has consistently demonstrated its vital role in supporting healthy, normal cellular activity.

Vitamin A: Another of the primary antioxidant vitamins, Vitamin A assists normal immune functions by enhancing the infection-fighting action of white blood cells.

Coenzyme Q10: Well known for its cardio-protective support, this natural compound is created and used by the body in normal cell respiration, helping cells use oxygen efficiently. CoQ10 is being studied in human research, and it has been found to support immune functioning in patients with severe autoimmune issues, as well as support the heart from damage that may be caused by some toxic residues that result from their required treatment regimens.

Selenium: This essential trace mineral produces antioxidant enzymes, which help prevent free radical damage to cells. Research suggests that selenium may help maintain normal cell functioning by protecting cell membranes. Selenium is also reported to help with normal cleansing processes, which may help minimize severity of side effects found with some traditional disease treatment protocols.

N-acetylcysteine: Another potent antioxidant, NAC is one form of the amino acid Cysteine, and it is known for its ability to assist the body in removing highly toxic heavy metal residue from tissues, residue that increases the cell damaging activity of free radicals. NAC is one of the few antioxidant compounds that is able to penetrate and protect the cells’ mitochondria, where the main energy-producing components of cells are found. NAC is also known to support healthy liver function and healthy immune system response in the respiratory system.

Green Tea Leaf (decaffeinated): This powerful antioxidant has protective compounds called polyphenols that neutralize free radicals in the body. Human research with green tea has shown that it maintains normal cell functioning in a wide variety of the most serious autoimmune disorders.

Each bottle contains 90 capsules containing a pleasantly flavored powder that is easy to administer.

This product was made in an FDA-approved facility using human-grade ingredients.

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The reviews below are presented for informational purposes only and are not intended as an endorsement of any product. The information is not intended to be a substitute for visits to your local veterinarian. Instead, these testimonials offer the reader information and opinions written by pet owners and/or veterinarians concerning animal health and products that they have used.

Having a feral colony, fostering, rescuing and having my own cats can get costly. can not always take them to the vets. I open the capsule and pour a little on every ones dish and mix with wet food. directions tell you to use half capsule twice a day, but I use 1 capsule for 4 dishes. It works providing you do this everyday. My sicker ones get it twice. I don't see the sneezing and watering eyes like I used too. But if I stop for a week, it starts to come back. I am really happy with this product.

My 9-month old puppy got a wart (canine papilloma) in her mouth on her gums from another pup at daycare that had warts on her paws. The wart grew to be the size of a cranberry and was just gross! The vet was charging me $900 for surgery and could not guarantee the wart would not return. I decided to try the all-natural route instead, and happy to report, it worked! I gave my puppy this immune stengthener every other day. Just broke the capsule and sprinkled it on her food. Then I put a few drops of thuya tincture (also sold on this website)on her food every other day, alternating the days with the immune stengthener. Lastly, I soaked a cottonball with organic apple cider vinegar and applied the vinegar directly to the wart every day 2X a day. I cured my pup in 2-1/2 months and less than $100. Like anything else I've tried for the first time, I was watching my dog carefully to see if she had any adverse reactions. When in doubt, I err on the side of giving less.

The Immune Strengthener says to give a dog/cat who is 0-25 lbs 1/2 capsule twice daily but I had a real problem doing that as you cannot split a gel capsule in half as one part is smaller then the other half.I have stopped using this product as it was to frustrating to measure then keep the other half for her dinnertime she only weights 4.5 pounds I know it is a "holistic product" but I did not want to make an error with her as she is very important to us as we rescued her from a hoarder when we took her we spent a lot of money to try and get her to live a normal life but nothing as worked. All our vet wants to do is operate on her and tells us it is only a 50-50 chance of it clearing up after the surgery which we have not done.

When my dog broke out in CV warts I was told there was nothing I could do but have them removed, but he would continue to break out with them. It's a virus that often is seen on older dogs whose immune system is weaking with age. I saw this product and I decided maybe it would help him not break out so bad having just had 18 new warts removed. to my happy surprise he has not had any new warts since he's been taking Immue Strengther twice a day. Couldn't be happier.

I bought a few bottles of this along with some bottles of thuja hoping to get rid of the warts on my 3 beagles. After 2 months of using this in combination with the thuja I have seen no results. DON'T WASTE YOUR MONEY if you're hoping to get rid of dog warts with this.

I have a Pug, Louie, and other fellow pug owners will tell you... they come with some health problems sometimes! Louie, as a puppy, had very bad red mange. None of the vet supplements or ointments helped and I did not want to resort to those nasty chemical dips. I started him on this natural supplement and within a month his mange was cured. Fast forward to NOW, he is 1 years old, and had a seizure a week ago. He was wobble and disoriented. Brought him to the vet and she suggested supplements and then if it happens again a neurologist. Started him on this again and ONCE AGAIN I am happy to say he has not had a seizure again. This stuff is amazing and I would recommend it to anyone who feels at a loss like i did.

I use twice a day at each feeding along with a Natural Pet Immune Balance capsule that the dog was already taking. He doesn't hesitate to eat a whole Immune Balance capsule tossed on his moistened meal or Immune Strengthener sprinkled on top although he isn't a picky eater. Due to almost constant chewing of itchy feet, I decided to try the Immune Strengthener along with Immune Balance and discontinued prescription allergy steroids from the vet. It immediately worked equally as well, maybe better, with no side effects and we have been using for 2 weeks now with continued success.

My cat, Dolly, was recently diagnosed with mammary (breast) cancer. After trying other products that didn't work, I decided to give the ONP Immune Strengthener a try. After the first dosage, there was a dramatic improvement with her health. I add a small amount to her moist food. My other cat, Lily, has chronic rhinitis and after the first doze, there was no more sneezing/coughing. For her I dilute a small amount in water and administer it by mouth with a syringe. This product is wonderful and it works!!!

We purchased this product for our dog last year because a friend (who has a pet-sitting business and lots of experience with different cats and dogs) recommended it. Oliver was always scratching and biting at his skin, and created horrible bloody sores. He was also missing areas of his fur from all the digging and scratching. This product DEFINITELY helped him. He scratched and dug less, and his sores healed and his coat grew back. I highly recommend this product! The only criticism that I have is that, since my dog is 20 pounds, you have to separate the pills and use half the powder in the morning (and then the rest of the pill at night). I wish they would consider making the pills in smaller dosages so that you can simply give a smaller dog one pill in the morning and one at night.